Power Apps : Filter expression with multiple conditions to filter gallery items.

Below code filters gallery items based on value selected in drop downs and matching the current logged in user.

Filter('Customer Appreciation', (StartsWith(Title,Dropdown1.SelectedText.Value)|| Dropdown1.SelectedText.Value=Blank()) && ('Appreciation Month'=Dropdown2.SelectedText.Value || Dropdown2.SelectedText.Value = Blank()) && (StartsWith('Created By'.Email,User().Email)))

Power Apps : Add Blank value to Drop Down

To add blank value on top of the drop down values which are fetched from some data source as shown below.

Write below line of code under “Items” property of the drop down.

Ungroup(
    Table(
        {DDMenuOptions: Table({DDValue: Blank()})},
        {DDMenuOptions: Filter('Customer Appreciation',"Title")}
    ),
    "DDMenuOptions"
)

Thank you.